package com.xiaohe.springcloud.lb;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * 功能描述
 *
 * @author 和振斌
 * @date 2021/1/13
 * @return
 */
@Component
public class myLB implements LoadBalancer {

    private AtomicInteger atomicInteger=new AtomicInteger(0);

    public final int getAndIncrement(){
        int current;
        int next;
        do {
          current=this.atomicInteger.get();
          next=current>=2147483647?0:current+1;
        }while (!this.atomicInteger.compareAndSet(current,next));
        System.out.println("------>"+next);
        return next;
    }

    @Override
    public ServiceInstance instance(List<ServiceInstance> serviceInstances) {
        int index = getAndIncrement() % serviceInstances.size();
        return serviceInstances.get(index);
    }
}
